WO2018181916A1 - Underfloor double skin structure, vehicle underfloor structure, and vehicle - Google Patents

Abstract

The present invention comprises: a first upper plate (35) which includes a pair of first thin wall portions (41A, 41B) arranged at each end and a first thick wall portion (43) disposed inside the pair of first thin wall portions (41A, 41B); a first lower plate (36) which is spaced below the first upper plate (35), and includes a pair of second thin wall portions (45A, 45B) arranged at each end and a second thick wall portion (47) disposed inside the pair of second thin wall portions (45A, 45B); a first rib group (38) which has a structure integral with the first upper plate (35) and the first lower plate (36), and connects the first upper plate (35) and the first lower plate (36); and a reinforcing body (40) which is composed of the first thick portion (43), the second thick portion (47), and a pair of thick ribs (55A, 55B).

Description

Underfloor double skin structure, vehicle underfloor structure, and vehicle

The present invention relates to an underfloor double skin structure, a vehicle underfloor structure, and a vehicle.
This application claims priority on March 31, 2017 based on Japanese Patent Application No. 2017-069448 filed in Japan, the contents of which are incorporated herein by reference.

A double skin structure excellent in weight reduction is applied as a vehicle body of a railway vehicle (for example, see Patent Document 1) which is one of vehicles.

The double skin structure has an upper plate and a lower plate, and a plurality of ribs. The upper plate and the lower plate are arranged in a state of being separated in the vertical direction of the vehicle. The plurality of ribs are disposed between the upper plate and the lower plate, and connect the upper plate and the lower plate. The upper plate, the lower plate, and the plurality of ribs are thinned plates. The double skin structure having such a structure is manufactured using an extrusion molding method.

When the vehicle underfloor structure is configured using the double skin structure, a plurality of double skin structures extending in the vehicle front-rear direction are arranged in the vehicle width direction and the adjacent double skin structures are joined to each other. . Specifically, for example, the upper plates and the lower plates are joined.
As described above, the double skin structure is composed of a thinned plate. For this reason, the double skin structure can easily align the ends (joining positions) of the adjacent double skin structures.

On the other hand, since the double skin structure is composed of a thin plate, its strength is weak. Therefore, in order to improve the strength of the vehicle underfloor structure, separately prepare a middle beam extending in the longitudinal direction of the vehicle, and weld the middle beam to the lower surface side of the double skin structure constituting the vehicle underfloor structure. Has been done.

Japanese Patent No. 36257779

However, when the intermediate beam is welded to the vehicle underfloor structure, it is necessary to perform welding over the entire length of the intermediate beam, which is very complicated.

Accordingly, the present invention provides an underfloor double skin and a vehicle underfloor structure that can be easily aligned with respect to the joining position of another double skin structure and that can improve the strength of the vehicle underfloor structure with a simple structure. The object is to provide a body and a vehicle.

In order to solve the above-described problem, an underfloor double skin structure according to an aspect of the present invention is an underfloor double skin structure constituting an underfloor of a vehicle, and includes a first upper plate extending in the front-rear direction of the vehicle. A first lower plate disposed below the first upper plate and spaced in the front-rear direction of the vehicle, and has an integrated structure with the first upper plate and the first lower plate, A first rib group that is provided between one upper plate and the first lower plate, and includes a plurality of ribs that connect the first upper plate and the first lower plate; The upper plate includes a pair of first thin portions that constitute both end portions in the width direction of the vehicle, and a first thick portion that is thicker than the pair of first thin portions. The plate includes a pair of second thin portions that constitute both ends of the vehicle in the width direction, and a second thick portion that is thicker than the pair of second thin portions. The first rib group is disposed at an interval in the width direction of the vehicle, and connects the first thick part and the second thick part, and also includes the first thin part and the first thick part. A pair of thick ribs having a thickness greater than two thin wall portions is included, and the first thick portion, the second thick portion, and the pair of thick ribs constitute a reinforcing body.

According to the present invention, an underfloor double skin structure (including a reinforcing body that improves the strength of the vehicle underfloor structure) including the first upper plate, the first lower plate, and the first rib group is formed as an integral structure. Thus, it is not necessary to weld the reinforcing body to the lower surface side of the first lower plate with the reinforcing body as a separate body from the first lower plate. Thereby, the intensity | strength of a vehicle underfloor structure can be improved with a simple structure.

Moreover, the 1st thick part is comprised by comprising the both ends of the width direction of the vehicle of the 1st upper board and 1st lower board connected with another double skin structure by a 1st thin part and a 2nd thin part. And compared with a 2nd thick part, it becomes possible to perform the deformation | transformation of the both ends of the width direction of the vehicle of a 1st upper board and a 1st lower board easily.
As a result, when another double skin structure is joined to both ends in the vehicle width direction of the underfloor double skin structure, it is easy to align the end of the underfloor double skin structure with the end of the other double skin structure. Can be done.

Further, in the underfloor double skin structure according to one aspect of the present invention, the reinforcing body may be partitioned so that a plane perpendicular to the front-rear direction of the vehicle is a closed space.

By adopting such a configuration, a groove, an opening, or the like does not exist in a portion of the reinforcing body that divides the space, so that a reduction in strength of the reinforcing body can be suppressed.

Moreover, in the underfloor double skin structure according to an aspect of the present invention, the second thick part and the pair of second thin parts are disposed adjacent to each other in the horizontal direction, and the second The thick part and the pair of second thin parts may form an integral structure in the width direction of the vehicle.

With this configuration, when the underfloor double skin structure is produced by the extrusion molding method, warpage is unlikely to occur in the underfloor double skin structure during the extrusion molding (in the middle of production). Therefore, an underfloor double skin structure can be easily manufactured using an extrusion method.

In the underfloor double skin structure according to one aspect of the present invention, the pair of thick ribs extend below the pair of second thin portions, and the second thick portion is the pair of thick walls. You may arrange | position below the 2nd thin part of.

By setting it as such a structure, it becomes possible to match | combine with the height of the lower surface of the middle beam fixed to the lower surface side of the conventional double skin structure.
Thereby, the double skin structure for underfloor is applied to the vehicle underfloor structure without changing the specification (for example, thickness, length, etc.) of the member directly or indirectly connected to the second thick portion. Can do.

Further, in the underfloor double skin structure according to one aspect of the present invention, the pair of thick ribs may connect the first thick portion and the second thick portion from the vertical direction.

As described above, the pair of thick ribs has a pair of thick ribs connecting the first thick portion and the second thick portion from the vertical direction, thereby increasing the strength of the reinforcing body against the load in the vertical direction. Can do.

In the underfloor double skin structure according to one aspect of the present invention, the first rib group includes a pair of inclined ribs that connect the first thick part and the second thick part, The inclined ribs may be inclined in a direction in which a distance between the pair of inclined ribs increases as the distance from the second thick part increases toward the first thick part.

By adopting such a configuration, the load received by the second thick part from below can be released in an oblique direction. Thereby, the load which a 2nd thick part receives from the downward direction can be disperse | distributed.

In the underfloor double skin structure according to one aspect of the present invention, the first thick part and the second thick part are flat plates, and the reinforcing body passes through a center position of the reinforcing body. In addition, it may be bilaterally symmetric with respect to a first plane that is orthogonal to the first thick part and the second thick part and is parallel to the longitudinal direction of the vehicle.

By configuring in this way, the left half structure and the right half structure of the reinforcement body have the same structure, so the difference in strength between the left half structure and the right half structure of the reinforcement body is reduced. Can be small.

Further, in the underfloor double skin structure according to one aspect of the present invention, the first thick part and the second thick part are flat plates, and at least the first thick part of the reinforcing body, The structure including the second thick part and the pair of thick ribs passes through an intermediate position between the first thick part and the second thick part, and the first thick part and the first thick part. It may be vertically symmetric with respect to a second plane parallel to the two thick portions.

Such a configuration can reduce the difference in strength between the upper part and the lower part of the reinforcing body.

Also, in the underfloor double skin structure according to one aspect of the present invention, the first thick portion and the pair of first thin portions are disposed adjacent to each other in the horizontal direction, and the first thickness. The meat portion and the pair of first thin portions have an integral structure in the width direction of the vehicle, and the pair of first thin portions, the pair of second thin portions, the first thick portion, The structure including the second thick portion and the pair of thick ribs passes through an intermediate position between the first thick portion and the second thick portion, and the first thick portion and the first thick portion. It may be vertically symmetric with respect to a second plane parallel to the two thick portions.

With such a configuration, when an underfloor double skin structure is produced using an extrusion molding method, warpage due to thermal shrinkage during extrusion occurs in the underfloor double skin structure during production. It becomes difficult. Thereby, the structure containing a pair of 1st thin part, a pair of 2nd thin part, and a reinforcement body can be shape | molded accurately using an extrusion molding method.

In order to solve the above-described problems, a vehicle underfloor structure according to an aspect of the present invention is provided at a position adjacent to the underfloor double skin structure and the underfloor double skin structure in the width direction of the vehicle. A second upper plate extending in the front-rear direction of the vehicle, and a second lower plate extending in the front-rear direction of the vehicle, spaced apart from the second upper plate and extending in the front-rear direction of the vehicle. A plate, the second upper plate, and the second lower plate are integrated with each other, provided between the second upper plate and the second lower plate, and the second upper plate and the second lower plate. A second rib group connecting the plate, and an end of the second upper plate is connected to an end of the first upper plate, and an end of the second lower plate is the first lower plate It may be connected to the end of.

By adopting such a configuration, an underfloor double skin structure is arranged in a portion of the vehicle underfloor structure that requires reinforcement, and another double skin structure that does not include a reinforcement in a portion that does not require reinforcement. By arranging the body, it becomes possible to join (for example, friction stir welding) the underfloor double skin structure and another double skin structure.
Thereby, since it is not necessary to weld the reinforcing body to the double skin structure, the strength of the vehicle underfloor structure of the vehicle can be improved with a simple structure.

In order to solve the above problems, a vehicle according to an aspect of the present invention may include the vehicle underfloor structure.

By adopting such a configuration, the strength of the vehicle underfloor structure against the load received from below can be increased.

Further, the vehicle according to one aspect of the present invention may include a pillow spring provided below the second thick part constituting the underfloor double skin structure.

By adopting such a configuration, it is possible to increase the strength of the vehicle underfloor structure against a load received from below the vehicle underfloor structure.

ADVANTAGE OF THE INVENTION According to this invention, while being able to perform alignment of the edge of the double skin structure for underfloor with respect to the edge of another double skin structure easily, and improving the intensity | strength of a vehicle underfloor structure with a simple structure. Can do.

1 is a front view showing a schematic configuration of a vehicle according to a first embodiment of the present invention. FIG. 2 is a plan view of the vehicle underfloor structure and a pair of side beams shown in FIG. 1. FIG. 3 is a cross-sectional view of the vehicle underfloor structure shown in FIG. 2 in the B ₁ -B ₂ line direction. It is sectional drawing to which the underfloor double skin structure shown in FIG. 3 was expanded. It is sectional drawing to which the double skin structure shown in FIG. 3 was expanded. It is sectional drawing which shows schematic structure of the double skin structure for underfloor which concerns on the modification of the 1st Embodiment of this invention. It is sectional drawing which shows a part of vehicle underfloor structure concerning the 2nd Embodiment of this invention.

Hereinafter, an embodiment to which the present invention is applied will be described in detail with reference to the drawings.

(First embodiment)
A vehicle 10 according to the first embodiment will be described with reference to FIGS. 1 to 5. In FIG. 1, as an example of the vehicle 10, a track type vehicle is illustrated as an example. 1 and 3 to 5, the X direction indicates the width direction of the vehicle 10, and the Z direction indicates the vertical direction and the height direction (also the vertical direction) of the vehicle 10, respectively. In FIG. 2, the Y direction indicates the front-rear direction of the vehicle 10 orthogonal to the X direction and the Z direction, and O ₁ indicates the center line O ₁ of the underfloor double skin structure 32 that passes through the center position A. The center position A is also an intermediate position between the first thick part 43 and the second thick part 47.
In FIG. 4, A is the center position of the reinforcing body 40 (hereinafter referred to as “center position A”), L ₁ passes through the center position A, and is relative to the first thick portion 43 and the second thick portion 47. A first plane that is orthogonal and parallel to the Y direction (hereinafter referred to as “first plane L ₁ ”) is shown. 1 to 5, the same components as those shown in FIGS. 1 to 5 are denoted by the same reference numerals.

In the first embodiment, as an example of the vehicle 10, a track type that travels on the travel path 4 of the track 2 by being guided by the side guide type guide rails 3 provided on both sides in the width direction of the track 2. A vehicle will be described as an example.

The vehicle 10 includes a vehicle body 15, a plate 17, bolts 18 </ b> A, nuts 18 </ b> B, and a traveling device 22.

The vehicle body 15 includes a vehicle underfloor structure 25 that constitutes an underfloor of the vehicle body, a pair of side beams 27A and 27B, a pair of side wall portions 29A and 29B, and a ceiling portion (not shown).

The vehicle underfloor structure 25 is provided between a pair of side beams 27A and 27B arranged in a state of being separated in the X direction. The vehicle underfloor structure 25 includes two underfloor double skin structures 32 extending in the Y direction and three double skin structures 33 (other double skin structures) extending in the Y direction.
The vehicle underfloor structure 25 is configured such that double skin structures 33 and underfloor double skin structures 32 are alternately arranged in the X direction.

Note that the numbers of the underfloor double skin structure 32 and the double skin structure 33 shown in FIGS. 1 and 2 are examples, and are not limited to these numbers.

The underfloor double skin structure 32 includes a first upper plate 35, a first lower plate 36, and a first rib group 38, and includes a reinforcing body 40. The underfloor double skin structure 32 is manufactured, for example, by extruding a lightweight alloy such as an aluminum alloy.

The first upper plate 35 extends in the Y direction. The first upper plate 35 includes a pair of first thin portions 41 </ b> A and 41 </ b> B and a first thick portion 43 that constitutes the reinforcing body 40.
The pair of first thin portions 41 </ b> A and 41 </ b> B extends in the Y direction and constitutes both ends of the first upper plate 35 in the X direction. The first thin portion 41A includes an end 35A arranged in the X direction. The first thin portion 41B includes an end 35B arranged in the X direction.
The pair of ends 35 </ b> A and 35 </ b> B (both ends) are connected to the double skin structure 33 disposed on both sides of the underfloor double skin structure 32 through the joint portion 60.

As the joint 60, for example, a friction stir weld formed at the time of friction stir welding can be used. In this case, the joint portion 60 is configured by a material that forms part of the ends 35A and 35B of the first upper plate 35 and a material that forms the end of the double skin structure 33 solidified after melting.

The first thick part 43 extends in the Y direction and is provided between the first thin part 41A and the first thin part 41B. The first thick portion 43 and the pair of first thin portions 41A and 41B are disposed adjacent to each other in the horizontal direction. The first thick portion 43 has an integrated structure with respect to the pair of first thin portions 41A and 41B in the X direction. That is, the first thick portion 43 and the pair of first thin portions 41A and 41B are integrally formed.

The first thick portion 43 is a portion that is thicker than the pair of first thin portions 41A and 41B. Further, the upper surface 43a of the first thick portion 43 is disposed at the same height as the upper surfaces 41a of the pair of first thin portions 41A and 41B in the Z direction. That is, the upper surface 35a of the first upper plate 35 constituted by the upper surface 41a of the pair of first thin portions 41A and 41B and the upper surface 43a of the first thick portion 43 is a flat surface.
Thereby, the 1st thick part 43 protrudes below the lower surface 41b of a pair of 1st thin parts 41A and 41B. The thickness of the first thick portion 43 can be set, for example, to 2 to 4 times the thickness of the pair of first thin portions 41A and 41B. As the first thick part 43, for example, a flat plate can be used.

The first lower plate 36 is disposed below the first upper plate 35 in a state of being separated from the first upper plate 35. The first lower plate 36 extends in the Y direction.
The first lower plate 36 has a pair of second thin portions 45 </ b> A and 45 </ b> B and a second thick portion 47 that constitutes the reinforcing body 40.

The pair of second thin portions 45 </ b> A and 45 </ b> B extends in the Y direction and constitutes both end portions of the first lower plate 36 in the X direction. The upper surfaces 45a of the second thin portions 45A and 45B are opposed to the lower surfaces 41b of the first thin portions 41A and 41B in the Z direction.
The second thin portion 45A includes an end 36A arranged in the X direction. The second thin portion 45B includes an end 36B disposed in the X direction.

The pair of ends 36 </ b> A and 36 </ b> B are connected to the double skin structure 33 disposed on both sides of the underfloor double skin structure 32 through the joint portion 60.
The thickness of the pair of second thin portions 45A and 45B can be the same as the thickness of the pair of first thin portions 41A and 41B, for example.

The second thick part 47 is provided between the second thin part 45A and the second thin part 45B. The thickness of the second thick part 47 is thicker than the thickness of the pair of second thin parts 45A and 45B.
The second thick part 47 and the pair of second thin parts 45A and 45B are disposed adjacent to each other in the horizontal direction. The second thick portion 47 has an integrated structure with respect to the pair of second thin portions 45A and 45B in the X direction. That is, the second thick part 47 and the pair of second thin parts 45A and 45B are integrally formed.

Thus, in the X direction, the second thick portion 47 and the pair of second thin portions 45A and 45B are integrated with each other, so that the position of the second thick portion 47 in the Z direction and the pair of second thin portions The difference from the position of the part can be reduced.
Thus, when the underfloor double skin structure 32 is manufactured by the extrusion molding method, warpage is unlikely to occur in the underfloor double skin structure 32 during extrusion molding (in the middle of manufacture). 32 can be manufactured easily.

The second thick part 47 faces the first thick part 43 in a state of being spaced below the first thick part 43. Thereby, the upper surface 47 a of the second thick part 47 faces the lower surface 43 b of the first thick part 43.
The width of the second thick portion 47 in the X direction can be set to the same size as the width of the first thick portion 43 in the X direction, for example. Further, the thickness of the second thick part 47 can be the same as the thickness of the first thick part 43, for example. As the second thick part 47, for example, a flat plate can be used.

The first rib group 38 has an integral structure with the first upper plate 35 and the first lower plate 36. That is, the first rib group 38 is integrally formed with the first upper plate 35 and the first lower plate 36.
The first rib group 38 includes a pair of first vertical ribs 51A and 51B, a pair of thick ribs 55A and 55B, a pair of first inclined ribs 56A and 56B, and a pair of second vertical ribs. 53A, 53B and a pair of second inclined ribs 58A, 58B.

The pair of first vertical ribs 51 </ b> A and 51 </ b> B are disposed between the first thick part 43 and the second thick part 47 in a state of being separated from each other in the X direction. The pair of first vertical ribs 51A and 51B extends in the Y direction. The pair of first vertical ribs 51 </ b> A and 51 </ b> B are orthogonal to the first thick part 43 and the second thick part 47.

The first vertical rib 51A connects one end of the first thick part 43 and one end of the second thick part 47 from the Z direction. The first vertical rib 51 </ b> B connects the other end of the first thick part 43 and the other end of the second thick part 47 from the Z direction.

The thickness of the pair of first vertical ribs 51 </ b> A and 51 </ b> B is thinner than the thickness of the first thick part 43 and the second thick part 47. The thickness of the pair of first vertical ribs 51A and 51B can be the same as, for example, the first thin portions 41A and 41B and the second thin portions 45A and 45B.

The second vertical rib 53A is provided between the first thin portion 41A constituting one end portion and the second thin portion 45A constituting one end portion. The second vertical rib 53A extends in the Y direction.
The second vertical rib 53A is orthogonal to the first thin portion 41A and the second thin portion 45A. The second vertical rib 53A connects one end of the first thin portion 41A and one end of the second thin portion 45A from the Z direction.

The second vertical rib 53B is provided between the first thin portion 41B constituting the other end and the second thin portion 45B constituting the other end. The second vertical rib 53B extends in the Y direction.
The second vertical rib 53B is orthogonal to the first thin portion 41B and the second thin portion 45B. The second vertical rib 53B connects the other end of the first thin portion 41B and the other end of the second thin portion 45B from the Z direction (vertical direction).

The thickness of the pair of second vertical ribs 53A and 53B is thinner than the thickness of the first thick part 43 and the second thick part 47. The thickness of the pair of second vertical ribs 53A and 53B can be the same as, for example, the first thin portions 41A and 41B and the second thin portions 45A and 45B.

The pair of thick ribs 55 </ b> A and 55 </ b> B is disposed between the first thick portion 43 and the second thick portion 47 in a state of being separated from the X direction. The pair of thick ribs 55A and 55B are disposed between the first vertical rib 51A and the first vertical rib 51B.
The pair of thick ribs 55A and 55B extends in the Y direction. The pair of thick ribs 55 </ b> A and 55 </ b> B are orthogonal to the first thick portion 43 and the second thick portion 47. The pair of thick ribs 55A and 55B connects the first thick portion 43 and the second thick portion 47 from the Z direction.

The thickness of the pair of thick ribs 55A and 55B is such that the first thin portions 41A and 41B, the second thin portions 45A and 45B, the pair of first vertical ribs 51A and 51B, the pair of second vertical ribs 53A and 53B, The first inclined ribs 56A and 56B and the pair of second inclined ribs 58A and 58B are thicker.
The thickness of the pair of thick ribs 55 </ b> A and 55 </ b> B can be the same as the thickness of the first thick portion 43 and the second thick portion 47, for example.

In this way, by connecting the first thick portion 43 and the second thick portion 47 from the Z direction by the pair of thick ribs 55A and 55B, the strength of the vehicle 10 against the load in the Z direction can be increased. It becomes possible. Thereby, the intensity | strength of the reinforcement body 40 containing a pair of thick rib 55A, 55B can be raised.

The first inclined rib 56A is provided between the first vertical rib 51A and the thick rib 55A. The first inclined rib 56A extends in the Y direction.
The first inclined rib 56A is inclined in a direction from the connection position between the second thick part 47 and the thick rib 55A toward the connection position between the first thick part 43 and the first vertical rib 51A. The first inclined rib 56 </ b> A is inclined with respect to the first thick part 43 and the second thick part 47. The first inclined rib 56A connects the first thick part 43 and the second thick part 47 from an oblique direction.

The first inclined rib 56B is provided between the first vertical rib 51B and the thick rib 55B. The first inclined rib 56B extends in the Y direction.
The first inclined rib 56B is directed from the connecting position between the second thick part 47 and the thick rib 55B to the connecting position between the first thick part 43 and the first vertical rib 51B (inclination of the first inclined rib 56A). The direction is opposite to the direction. The first inclined rib 56 </ b> B is inclined with respect to the first thick part 43 and the second thick part 47. The first inclined rib 56B connects the first thick part 43 and the second thick part 47 from an oblique direction.

The first inclined ribs 56A and 56B configured as described above are inclined in the direction in which the distance between the first inclined rib 56A and the first inclined rib 56B is increased from the second thick portion 47 toward the first thick portion 43. is doing.

Thus, while connecting the 1st thick part 43 and the 2nd thick part 47, the 1st inclination rib which inclines in the direction where a space | interval spreads as it goes to the 1st thick part 43 from the 2nd thick part 47. By having 56A, 56B, it is possible to release the load received by the second thick portion 47 from below in an oblique direction (inclination direction of the first inclined ribs 56A, 56B). Thereby, the load which the 2nd thick part 47 receives from the downward direction can be disperse | distributed.

The second inclined rib 58A extends in the Y direction, and is provided between the first vertical rib 51A and the second vertical rib 53A. The second inclined rib 58A connects the first thin portion 41A and the second thin portion 45A in a state inclined in the opposite direction to the first inclined rib 56A provided at the adjacent position.

The second inclined rib 58B extends in the Y direction and is provided between the first vertical rib 51B and the second vertical rib 53B. The second inclined rib 58B connects the other first thin portion 41B and the other second thin portion 45B while being inclined in the opposite direction to the first inclined rib 56B provided at the adjacent position. .

The shapes and numbers of the first vertical ribs 51A and 51B, the second vertical ribs 53A and 53B, the first inclined ribs 56A and 56B, and the second inclined ribs 58A and 58B shown in FIG. It is not limited to the shape and number shown in.

The reinforcing body 40 includes the first thick part 43, the second thick part 47, the pair of first vertical ribs 51A and 51B, the pair of thick ribs 55A and 55B, the pair of first inclined ribs 56A, 56B and a space 62.

The space 62 is partitioned in the X direction and the Z direction by the first thick portion 43, the second thick portion 47, and the thick ribs 55A and 55B. The space 62 extends in the Y direction. The reinforcing body 40 partitions a plane (virtual plane) orthogonal to the Y direction so as to be a closed space. The reinforcement body 40 is arrange | positioned so that the circumference | surroundings of a virtual plane may be enclosed.

The “closed space” in the present invention means that the space 62 is X in a state where the underfloor double skin structure 32 and other parts are assembled and the underfloor double skin structure 32 becomes a part of the vehicle 10. This refers to a space that does not communicate with other spaces (spaces formed outside the space 62) arranged in the direction and the Z direction.

As described above, the space 62 defined by the first thick portion 43, the second thick portion 47, and the pair of thick ribs 55A and 55B is a closed space in the plane direction perpendicular to the Y direction. In the first thick portion 43, the second thick portion 47, and the thick ribs 55A and 55B, there are no grooves, openings, or the like in the portion defining the space 62. Can be suppressed.

The reinforcing body 40 is configured to be bilaterally symmetric with respect to the first plane L ₁ that passes through the center position A of the reinforcing body 40 and is orthogonal to the first thick portion 43 and the second thick portion 47. It is preferable to do.

In this way, the reinforcing body passes through the center position A of the reinforcing body 40 and is symmetrical with respect to the first plane L ₁ orthogonal to the first thick portion 43 and the second thick portion 47. Since the left half structure and the right half structure of the reinforcement body 40 have the same structure, the difference in strength between the left half structure body and the right half structure body of the reinforcement body 40 is reduced. Can be small.

In the reinforcing body 40, the structure including the first thick part 43, the second thick part 47, and the pair of thick ribs 55 </ b> A and 55 </ b> B includes the first thick part including the center position A of the reinforcing body 40. So as to be vertically symmetrical with respect to a second plane L ₂ that passes through an intermediate position between the portion 43 and the second thick portion 47 and is parallel to the first thick portion 43 and the second thick portion 47. It is preferable to configure.

As described above, the structure including at least the first thick part 43, the second thick part 47, and the pair of thick ribs 55A and 55B in the reinforcing body 40 passes through the center position A of the reinforcing body 40. and by configuring so as to be vertically symmetrical with respect to the second plane L ₂ parallel to the first thick portion 43 and the second thick portion 47, the difference in intensity in the upper and lower reinforcement 40 Can be reduced.

According to the underfloor double skin structure 32 of the first embodiment, the underfloor double skin structure 32 (including the reinforcing body 40) including the first upper plate 35, the first lower plate 36, and the first rib group 38. ) As an integral structure, it is not necessary to weld the reinforcing body to the lower surface side of the first lower plate, with the reinforcing body improving the strength of the vehicle underfloor structure as a separate body from the first lower plate. Thereby, the intensity | strength of the vehicle underfloor structure 25 can be improved with a simple structure.

Further, by configuring the X-direction both ends of the first upper plate 35 and the first lower plate 36 connected to the double skin structure 33 with the first thin portions 41A and 41B and the second thin portions 45A and 45B, The positions of the ends 35A, 35B, 36A, 36B in the X direction of the first upper plate 35 and the first lower plate 36 can be displaced.

Thus, when the double skin structure 33 is connected to the X-direction ends 35A, 35B, 36A, 36B of the underfloor double skin structure 32, the underfloor double skin structure 32 ends 35A, 35B, 36A, 36B are doubled. The alignment with the ends 66A, 66B, 67A, 67B of the skin structure 33 can be easily performed.

The double skin structure 33 includes a second upper plate 66, a second lower plate 67, and a second rib group 69.
The second upper plate 66 extends in the Y direction. The second upper plate 66 is a plate having a uniform thickness. The ends 66A and 66B (both ends) in the X direction of the second upper plate 66 are connected to any one of the side beam 27A, the side beam 27B, the end 35A, and the end 35B through the joint portion 60, respectively. ing. The thickness of the second upper plate 66 can be set to the same thickness as the first thin portions 41A and 41B, for example.

The second lower plate 67 is disposed to face the second upper plate 66 with a space below the second upper plate 66. The second lower plate 67 extends in the Y direction. The second lower plate 67 is a plate having a uniform thickness.
The ends 67A and 67B (both ends) in the X direction of the second lower plate 67 are connected to any one of the side beam 27A, the side beam 27B, the end 36A, and the end 36B through the joint portion 60, respectively. ing. The thickness of the second lower plate 67 can be the same as that of the second thick portion 47, for example.

The second rib group 69 includes a plurality of third vertical ribs 71 and a plurality of third inclined ribs 73.
The plurality of third vertical ribs 71 are provided between the second upper plate 66 and the second lower plate 67. The plurality of third vertical ribs 71 are arranged in the X direction at a predetermined interval.

The plurality of third vertical ribs 71 extend in the Y direction and are orthogonal to the second upper plate 66 and the second lower plate 67. The plurality of third vertical ribs 71 connect the second upper plate 66 and the second lower plate 67. Between the two third vertical ribs 71 adjacent to each other, the Z direction is partitioned by the second upper plate 66 and the second lower plate 67, and a space 74 extending in the Y direction is formed.
The thickness of the third vertical rib 71 can be set to the same thickness as the first thin portions 41A and 41B and the second thin portions 45A and 45B, for example.

A plurality of third inclined ribs 73 are provided in each space 74. The plurality of third inclined ribs 73 connect the second upper plate 66 and the second lower plate 67 while being inclined with respect to the second upper plate 66 and the second lower plate 67. Further, two adjacent third inclined ribs 73 are inclined in different directions. The thickness of the plurality of third inclined ribs 73 can be the same as, for example, the first thin portions 41A and 41B and the second thin portions 45A and 45B.

According to the vehicle underfloor structure 25 of the first embodiment, the underskin double skin structure 32 is disposed in a portion of the vehicle underfloor structure 25 that needs reinforcement, and the reinforcement 40 is disposed in a portion that does not require reinforcement. The under-skin structure 25 is configured by arranging the double-skin structure 33 that does not include the joint and joining the under-skin double-skin structure 32 and the double-skin structure 33 (for example, friction stir welding). Is possible.
Thereby, since it is not necessary to weld a reinforcing body to the double skin structure, the strength of the vehicle underfloor structure 25 of the vehicle 10 can be improved with a simple structure.

The side beams 27A are joined to a double skin structure 33 that constitutes one end of the vehicle underfloor structure 25 in the X direction. The side beams 27B are joined to a double skin structure 33 that constitutes the other end portion in the X direction of the vehicle underfloor structure 25.
Accordingly, the side beams 27A and 27B are arranged so as to sandwich the vehicle underfloor structure 25 from the X direction. As the side beams 27A and 27B, for example, a double skin structure can be used.

The side wall portion 29A is provided on the side beam 27A. The side wall portion 29A extends in the Z direction and the Y direction. The lower end of the side wall part 29A is connected to the side beam 27A via a joint part (not shown).
The side wall portion 29B is provided on the side beam 27B. The side wall portion 29B extends in the Z direction and the Y direction. The lower end of the side wall portion 29B is connected to the side beam 27B via a joint portion (not shown). As the side wall portions 29A and 29B, for example, a double skin structure can be used.

The ceiling part (not shown) connects the upper end of the side wall part 29A and the upper end of the side wall part 29B. The ceiling portion extends in the Y direction. As the ceiling portion, for example, a double skin structure can be used.

The plate 17 is provided on the lower surface 47 b of the second thick part 47. The plate 17 is fixed to the second thick portion 47 by a bolt 18A penetrating the plate 17 and the second thick portion 47, and a nut 18B provided on a shaft portion of the bolt 18A.

The traveling device 22 is a device that supports the vehicle body 15 so as to be able to travel from below. The traveling devices 22 are provided at the front portion and the rear portion of the vehicle body 15, respectively.
The traveling device 22 includes an air spring 76 that is a pillow spring, a damper 78, an electric motor (not shown), a drive shaft (not shown), a gear box 81, an axle 83, and a pair of traveling wheels. 84, a suspension device (not shown), and a guide mechanism 86.

The air spring 76 is disposed between the plate 17 and the carriage frame 88. The air spring 76 is fixed to the lower surface side of the plate 17. Accordingly, the air spring 76 is provided on the lower surface 47 b of the second thick portion 47 through the plate 17.
In this way, by providing the air spring 76 on the plate 17 fixed to the lower surface 47b of the second thick portion 47 constituting the vehicle underfloor structure 25, the load received from below the vehicle underfloor structure 25 through the plate 17 can be reduced. The strength of the vehicle underfloor structure 25 can be increased.

As the air spring 76, for example, a bag-shaped member made of an elastic body (for example, rubber) capable of storing compressed air inside can be used. Although the air spring 76 has been described as an example of the pillow spring, a pillow spring other than the air spring 76 may be used.
The damper 78 is provided so as to connect the plate 17 and the carriage frame 88.

An electric motor (not shown) generates rotational power using electric power supplied from the outside. A drive shaft is connected to the drive shaft of the electric motor. The electric motor is connected to the gear box 81 via a drive shaft.
The electric motor 5 has a casing (not shown) that covers the outside. The casing is attached to the lower surface of the vehicle underfloor structure 25 via a vibration isolating material (not shown) such as a vibration isolating rubber.

The gear box 81 houses a power transmission mechanism such as a differential mechanism and a speed reduction mechanism. The rotational power transmitted from the electric motor to the gear box 81 is distributed to an axle shaft (not shown). The axle shaft extends from the gear box 81 on both sides in the X direction and is linked to the traveling wheels 84.

The axle 83 extends on both sides in the X direction, and the base is connected to the gear box 81. The axles 83 are rotatably supported by a pair of bogie frames 88 that are spaced apart in the X direction.

The pair of traveling wheels 84 are connected to the ends of the axles 83 extending on both sides in the X direction. As the wheel 84, for example, a wheel with a tire to which a rubber tire is attached can be used.

The suspension device (not shown) is a device for transmitting the driving force and the braking force of the wheel 84 to the vehicle body 15 while allowing the wheel 84 to move up and down with respect to the vehicle body 15. The suspension device includes a carriage frame 88, a traction link mechanism (not shown), and a suspension frame (not shown).

The bogie frame 88 is spaced apart so as to sandwich the gear box 81 from the X direction. The carriage frame 88 supports the axle 83 in a rotatable state.

The tow link mechanism (not shown) is provided on the lower surface side of the vehicle underfloor structure 25. The traction link mechanism transmits a force acting in the front-rear direction of the vehicle 10 such as a driving force and a braking force by the wheels 84 from the carriage frame 88 to the suspension frame while allowing the carriage frame 88 to be displaced in the Z direction with respect to the vehicle body 15. To do.
The suspension frame (not shown) is provided on the lower surface side of the vehicle underfloor structure 25. The suspension frame (not shown) transmits the traveling direction force transmitted through the traction link mechanism to the vehicle body 15.

The guide mechanism 86 is a mechanism that, for example, changes the steering angle of the wheel 84 according to the arc shape of the curved portion of the track 2 when the vehicle 10 travels on the travel path 4 of the track 2.

According to the vehicle 10 of the first embodiment, the air spring 76 is provided on the plate 17 fixed to 47 b on the lower surface of the second thick portion 47 constituting the vehicle underfloor structure 25, so that the vehicle underfloor is passed through the plate 17. The strength of the vehicle underfloor structure 25 against the load received from below the structure 25 can be increased.

Next, an underfloor double skin structure 90 according to a modification of the first embodiment will be described with reference to FIG. In FIG. 6, C is the center position of the reinforcing body 91 (hereinafter referred to as “center position C”), and D ₁ passes through the center position C, and with respect to the first thick portion 43 and the second thick portion 47. A first plane (hereinafter referred to as “first plane D ₁ ”) that is orthogonal and parallel to the Y direction (see FIG. 2), D ₂ is the first thick portion 43 including the center position C and the second thickness. Second planes (hereinafter referred to as “second plane D ₂ ”) that pass through an intermediate position with the meat part 47 and are parallel to the first thick part 43 and the second thick part 47 are respectively shown. . In FIG. 6, the same components as those in the structure shown in FIG.

The underfloor double skin structure 90 is the same as the underfloor double skin structure 32 except that the underfloor double skin structure 90 has a reinforcing body 91 instead of the reinforcing body 40 constituting the underfloor double skin structure 32 of the first embodiment. It is configured.
The reinforcing body 91 is configured in the same manner as the reinforcing body 40 except that the lower surface 47b of the second thick portion 47 is arranged so as to be flush with the lower surfaces 45b of the second thin portions 45A and 45B. .

The reinforcing body 91 configured as described above is symmetrical with respect to the first plane D ₁ that passes through the center position A of the reinforcing body 91 and is orthogonal to the first thick portion 43 and the second thick portion 47. It is said that.

The structure including the pair of first thin portions 41A and 41B, the pair of second thin portions 45A and 45B, the first thick portion 43, the second thick portion 47, and the pair of thick ribs 55A and 55B Further, the reinforcing body 91 is symmetrical with respect to the second plane D ₂ that passes through the center position C and is parallel to the first thick portion 43 and the second thick portion 47.

Thus, passes through the center position C of the reinforcing member 91, and the second plane _{D 2,} a pair of first thin portion 41A, 41B, a pair of second thin portion 45A, 45B, and the reinforcing member 91 When the underfloor double skin structure 90 is manufactured using the extrusion molding method, the underfloor double skin structure 90 is caused by thermal contraction when the underfloor double skin structure 90 is manufactured using the extrusion molding method. Warpage is less likely to occur.
Thereby, the structure containing a pair of 1st thin part 41A, 41B, a pair of 2nd thin part 45A, 45B, and the reinforcement body 91 can be shape | molded accurately using an extrusion molding method.

(Second Embodiment)
With reference to FIG. 7, the vehicle underfloor structure 100 of 2nd Embodiment is demonstrated. In FIG. 7, E is the center position of the reinforcing body 105 (hereinafter referred to as “center position E”), F ₁ passes through the center position E, and is relative to the first thick portion 43 and the second thick portion 47. The orthogonal first planes (hereinafter referred to as “first plane F ₁ ”) are respectively shown. In FIG. 7, the same components as those of the structure shown in FIG.

The vehicle underfloor structure 100 according to the second embodiment is different from the vehicle underfloor structure 25 according to the first embodiment except that the vehicle has an underfloor double skin structure 101 instead of the underfloor double skin structure 32. It is configured in the same manner as the vehicle underfloor structure 25.

The underfloor double skin structure 101 includes a first lower plate 103 and a reinforcing body 105 in place of the first lower plate 36 and the reinforcing body 40 constituting the underfloor double skin structure 32 of the first embodiment. The lower skin of the pair of thick ribs 55A and 55B is configured in the same manner as the double-skin structure 32 for the underfloor except that the lower portions are extended to positions below the pair of second thin portions 45A and 45B.

The first lower plate 103 has a pair of second thin portions 45 </ b> A and 45 </ b> B, a third thin portion 107, and a second thick portion 47. The third thin portion 107 is provided between the second thin portion 45A and the second thin portion 45B. The third thin portion 107 and the pair of second thin portions 45A and 45B are integrally formed.
The third thin portion 107 connects the pair of second thin portions 45A and 45B in the X direction and extends in the Y direction. The thickness of the third thin portion 107 can be set to the same thickness as the pair of second thin portions 45A and 45B, for example.

The second thick portion 47 is separated from the pair of second thin portions 45A and 45B and the third thin portion 107. The second thick part 47 is disposed below the pair of second thin parts 45 </ b> A and 45 </ b> B and the third thin part 107 in a state of being separated from the third thin part 107. Accordingly, the first lower plate 103 of the second embodiment has a two-stage configuration.
On the upper surface side of the second thick part 47, the lower ends of the pair of thick ribs 55A and 55B are integrally formed. Thereby, the second thick portion 47 is supported at a predetermined height below the third thin portion 107.

The reinforcing body 105 includes a first thick portion 43, a second thick portion 47, a pair of first vertical ribs 51A and 51B, a pair of thick ribs 55A and 55B, a pair of first inclined ribs 56A and 56B, and a third. A part of the thin portion 107 and spaces 62 and 109 are provided.

The space 62 is partitioned in the X direction and the Z direction by the first thick portion 43, the third thin portion 107, and the pair of thick ribs 55A and 55B. The space 62 extends in the Y direction. The space 62 is a closed space in a plane direction (plane direction including the X direction and the Z direction) orthogonal to the Y direction.

The space 109 is a space formed below the space 62. The space 109 is partitioned in the X direction and the Z direction by the second thick portion 47, the third thin portion 107, and the pair of thick ribs 55A and 55B. The space 109 extends in the Y direction. The space 109 is a closed space in a plane direction (plane direction including the X direction and the Z direction) orthogonal to the Y direction.

In this way, the first thick portion 43 and the second thickness constituting the reinforcing body 105 are formed by making the spaces 62 and 109 formed in the reinforcing body 105 closed in the plane direction orthogonal to the Y direction. Since the groove 47, the opening, and the like are not formed in the meat portion 47, the pair of thick ribs 55A and 55B, and the third thin portion 107, a decrease in strength of the reinforcing body 105 can be suppressed.

The reinforcing body 105 configured as described above is symmetrical with respect to the first plane F ₁ passing through the center position E of the reinforcing body 105 and orthogonal to the first thick part 43 and the second thick part 47. It becomes the shape which becomes.
As a result, the left half structure and the right half structure of the reinforcing body 105 have the same structure, so that the difference in strength between the left half structure and the right half structure of the reinforcing body 105 is reduced. Can do.

According to the underfloor double skin structure 101 of the second embodiment, the second thick part 47 and the pair of second thin parts 45A, 45B are separated from each other and more than the pair of second thin parts 45A, 45B. By disposing the second thick portion 47 below, the position of the lower surface 47b of the second thick portion 47 in the height direction (Z direction) is fixed to the lower surface of the conventional double skin structure. It becomes possible to match the position of the lower surface in the height direction.

Thereby, the specification (for example, thickness and length) of the member (in the case of the second embodiment, for example, the plate 17, the air spring 76, and the carriage frame 88) that is directly or indirectly connected to the second thick part. Etc.), the underfloor double skin structure 101 can be applied to the vehicle underfloor structure 100.

The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to such specific embodiments, and various modifications can be made within the scope of the gist of the present invention described in the claims. Deformation / change is possible.

For example, in the first and second embodiments, a track type vehicle has been described as an example of the vehicle, but the underskin double skin structures 32, 90, described in the first and second embodiments are described. 101 can also be applied to vehicles other than track-type vehicles.

The present invention is applicable to an underfloor double skin structure, a vehicle underfloor structure, and a vehicle.

2 track 3 guide rail 4 travel path 10 vehicle 17 plate 18A bolt 18B nut 22 travel device 25,100 vehicle underfloor structure 27A, 27B side beam 29A, 29B side wall 32, 90, 101 underfloor double skin structure 33 double skin Structure 35 First upper plate 35a, 41a, 43a, 45a, 47a Upper surface 35A, 35B, 36A, 36B, 66A, 66B, 67A, 67B End 36, 103 First lower plate 38 First rib group 40, 91, 105 Reinforcing body 41A, 41B First thin portion 41b, 43b, 45b, 47b Lower surface 43 First thick portion 45A, 45B Second thin portion 47 Second thick portion 51A, 51B First vertical rib 53A, 53B Second vertical rib 55A, 55B Thick ribs 56A, 56B First inclined ribs 58A, 58 Second inclined rib 60 Joint portion 62, 74, 109 Space 66 Second upper plate 67 Second lower plate 69 Second rib group 71 Third vertical rib 73 Third inclined rib 76 Air spring 78 Damper 81 Gear box 83 Axle 84 Wheel 86 Guide mechanism 88 Bogie frame 107 Third thin portion A, C, E Center position L ₁ , D ₁ , F ₁ First plane L ₂ , D ₂ Second plane

Claims (12)

1. An underfloor double skin structure that constitutes the underfloor of the vehicle,
   A first upper plate extending in the longitudinal direction of the vehicle;
   A first lower plate that is disposed below the first upper plate with an interval and extends in the front-rear direction of the vehicle;
   The first upper plate and the first lower plate are integrated with each other, provided between the first upper plate and the first lower plate, and the first upper plate and the first lower plate A first rib group composed of a plurality of ribs to be connected;
   With
   The first upper plate includes a pair of first thin portions that constitute both ends of the vehicle in the width direction, and a first thick portion that is thicker than the pair of first thin portions,
   The first lower plate includes a pair of second thin portions that constitute both ends in the width direction of the vehicle, and a second thick portion that is thicker than the pair of second thin portions,
   The first rib group is disposed at an interval in the width direction of the vehicle and connects the first thick part and the second thick part, and the first thin part and the second thin part. A pair of thick ribs that are thicker than,
   An underfloor double skin structure in which the first thick part, the second thick part, and the pair of thick ribs constitute a reinforcing body.
2. The double skin structure for underfloor according to claim 1, wherein the reinforcing body partitions a plane perpendicular to the front-rear direction of the vehicle to be a closed space.
3. The second thick part and the pair of second thin parts are arranged adjacent to each other in the horizontal direction,
   3. The underskin double skin structure according to claim 1, wherein the second thick part and the pair of second thin parts form an integrated structure in a width direction of the vehicle.
4. The pair of thick ribs extend below the pair of second thin portions,
   The double skin structure for underfloor according to claim 1 or 2, wherein the second thick part is disposed below the pair of second thin parts.
5. The pair of thick ribs is an underfloor double skin structure according to any one of claims 1 to 4, wherein the first thick portion and the second thick portion are connected in a vertical direction.
6. The first rib group includes a pair of inclined ribs that connect the first thick part and the second thick part,
   The double skin structure for underfloor according to claim 5, wherein the pair of inclined ribs are inclined in a direction in which a distance between the pair of inclined ribs is increased from the second thick part toward the first thick part.
7. The first thick part and the second thick part are flat plates,
   The reinforcing body passes through a central position of the reinforcing body, and is on a first plane that is orthogonal to the first thick portion and the second thick portion and parallel to the front-rear direction of the vehicle. The double skin structure for underfloor according to any one of claims 1 to 6, which is symmetrical with respect to the left and right.
8. The first thick part and the second thick part are flat plates,
   Among the reinforcing bodies, a structure composed of at least the first thick part, the second thick part, and the pair of thick ribs is an intermediate between the first thick part and the second thick part. The double skin for under floor according to any one of claims 1 to 7, wherein the double skin is vertically symmetrical with respect to a second plane passing through a position and parallel to the first thick part and the second thick part. Structure.
9. The first thick part and the pair of first thin parts are arranged adjacent to each other in the horizontal direction, and the first thick part and the pair of first thin parts are a width of the vehicle. In one direction,
   The structure including the pair of first thin portions, the pair of second thin portions, the first thick portion, the second thick portion, and the pair of thick ribs includes the first thick portion, 4. The under floor use according to claim 3, which passes through an intermediate position with respect to the second thick part and is vertically symmetrical with respect to a second plane parallel to the first thick part and the second thick part. Double skin structure.
10. A double skin structure for underfloor according to any one of claims 1 to 9,
    In the width direction of the vehicle, another double skin structure provided at a position adjacent to the underfloor double skin structure,
    With
    A second upper plate extending in the longitudinal direction of the vehicle;
    A second lower plate that is disposed below the second upper plate with an interval and extends in the front-rear direction of the vehicle;
    The second upper plate and the second lower plate are integrated with each other, provided between the second upper plate and the second lower plate, and the second upper plate and the second lower plate A second rib group to be connected;
    With
    An end of the second upper plate is connected to an end of the first upper plate,
    An end of the second lower plate is a vehicle underfloor structure connected to an end of the first lower plate.
11. A vehicle comprising the vehicle underfloor structure according to claim 10.
12. The vehicle according to claim 11, further comprising a pillow spring provided below a second thick part constituting the double skin structure for under floor.

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